| Title
SVALEX-2011
Notes on instrumentation support
|
By
O.M.
| Date
29 January 2013
| Version
0.1
|
Click to open photo album.
INTRODUCTION
SVALEX is an annual student field course that takes place on Svalbard. It is a cooperative effort between several universities in Norway, and sponsored by Statoil.
The course activities covers a broad range of topics and are located at different sites. Department of Earth Science is responsible for the marine seismic survey, using research vessel "Håkon Mosby". Data is acquired by a 3 km, 240 ch digital streamer and also processed on board, using SeismicUnix.
Most students have never visited a seismic vessel, so at first sight the instrumentation can appear overwhelming. After a while, however, the working of each sub-system - airgun control system, streamer recording and navigation, "birds" (i.e. vertical streamer control) - becomes clear and the students will quickly be able to monitor the complete seismic acquisition process unaided. As a safety precaution, instructors use a web based monitoring system running in the background, providing continuous supervision of important parameters like distance off line, airgun pressure and timing, streamer bird positioning, with alarm settings on each. The monitoring system can be viewed on any PC connected to the vessel network.
RV Mosby instrumentation lab.
MAPS
CLICK MAPS TO SEE LARGER VERSIONS.
SVALEX-2011 Isfjorden - click to enlarge.
SVALEX-2011 Van Mijenfjord - click to enlarge.
KML file showing all SVALEX-2011 seismic lines. Right click link below, select Save Target As (and use "kml" as file extension, not "xml" as Internet Explorer will insist), then open file in Google Earth:
HSE - HEALTH, SAFTETY, ENVIRONMENT
Material Safety Datasheets
| Description
| Document
|
| HSE datasheet ISOPAR-M - oil used in all sections of main streamer
| Link
|
| HSE datasheet MOBILECT-44 - oil used in mini-streamer
| Link
|
Lithium batteries for Streamer Birds, HSE datasheet.
Battery supplier: http://www.iongeo.com/
| Link
|
Airgun handling
| Applies to
| Procedure
|
| Single airgun: Deployment
|
- One person from the crew of HÅKON MOSBY is needed to handle the crane, as well as at least one trained person from GEO; a maximum of 3 persons. Before commencing the deployment of the guns, one must make sure that the trigging is switched off (GUNCO is in SAFE position), and that the gun is not filled with air under pressure. Remember to inform the bridge.
- The gun is deployed to ca. one meter above the sea surface. At this point the gun has to be filled with air, and lowered to the required depth.
- This procedure is repeated until all single guns are in the sea. When the deployment is finished, the responsible in the instrument-room and the bridge must be informed.
|
| Single airgun: Recovery
|
- One person from the crew of HÅKON MOSBY is needed to handle the crane, as well as at least one trained person from GEO; a maximum of 3 persons. Before recovery, one must make sure that trigging is switched off (GUNCO is in SAFE position), and that the compressor is switched off. The bridge must be informed.
- Before the recovery of the gun, the air-supply must be switched off, and the air-pressure must be decreased to ca. 20 kg. The gun is recovered to ca. one meter above the sea surface. At this point the air must be removed from the gun.
- The gun is recovered on board the ship. IMPORTANT: WHEN THE GUN IS TO BE LOWERED ONTO THE DECK, THE GUN MUST NEVER BE TOUCHED; USE THE ATTACHED ROPE. When the gun is on board, recover the harness. Inform the bridge and the instrument-room when the guns are on deck.
Concerning use of personal safety-equipment, it is referred to the internal safety instructions for marine seismic fieldwork (enclosed).
|
Streamer handling
During deployment and recovery of the streamer the following procedure must be followed:
- One person (from the ship crew) is needed to maneuver the crane, and two persons, with the proper training, is needed from GEO. Max. 4 persons. Before starting deployment/recovery; notify the bridge.
- During deployment and recovery the stern port must be open. Therefore all persons who work near the rear end of the deck must wear survival suit and line, or life west and line, in addition to ordinary safety outfit, As soon as the stern port has been opened and the tail buoy has been deployed, a rope should be attached across the stern port.
- During deployment/recovery birds must be attached/detached to the streamer. A high level of precaution must be held by the person who is lifting the birds across the stern port. If refilling of fluid (ISOPAR-M) in the streamer is needed, spilling on deck must be avoided, since oil on deck causes this to become very slippery. When the streamer has been completely deployed, the cable reel must be secured with its brake. When the deployment/recovery has been completed, the responsible in the instrument laboratory and the bridge must be notified.
- As long as the streamer is in the sea the stern port will remain open. Personal movements on the rear deck should be limited to a minimum. Persons who need to go there should always notify the instrument laboratory/bridge beforehand.
As for use of personal safety equipment/outfit, it is referred to "Internal safety instructions for marine seismic fieldwork".
RECORDING LOG SHEET
SEISMIC SURVEY PARAMETERS
Most of this information also placed in UKOOA P1/90 headers.
Source
- 4 airguns, total volume: 766 CUIN
- No 1: BOLT 1900 90 CUIN
- No 2: BOLT 1500 240 CUIN
- No 3: BOLT 1500 300 CUIN
- No 4: BOLT 1900 136 CUIN
- Depth nominal: 6 M
- Pressure nominal: 138 BAR
- Distance nav reference location to source: xx meter
Streamer
- Distance nav reference location to first seismic channel: xxx meter
- It follows that OFFSET SHIP SYSTEM 1ST CH: xxx.x meter
Navigation
- Nav reference location = Position of gravity meter
- Nav data UTM Zone: 33X
GEOPHYSICAL EQUIPMENT
| Item no.
| Name
| Description
| Links
|
| 1
| Gravitymeter
| S/N: S-99, L&R sensor, modified by ZLS
|
- Gravitymeter
|
| 2
| Magnetometer
| Geometrics, Mod. G-882
|
- Magnetometer
|
| 3
| Navigation system
|
- EIVA Survey Computer
- Software: NaviPack
- Diff GPS:
- Fugro "SeaStar", mod. 3510 LR
| http://www.eiva.dk
|
| 4
| Airguns
|
- 4 ea
- Manufacturer: Bolt Technology
- Total volume: 766 inch 3
- NO 1: BOLT 1900 90 inch 3
- NO 2: BOLT 1500 240 inch 3
- NO 3: BOLT 1500 300 inch 3
- NO 4: BOLT 1900 136 inch 3
- Air pressure, firing moment: 138 Bar = 2000 psi
- Source depth: 6 m
| -
|
| 5
| Gun control system
| Geco GUNCO
| GUNCO documentation
|
Streamer tailbuoy, packing
CLICK TO SEE LARGE VERSIONS
Streamer map, dated 22 August 2011
CLICK TO SEE LARGE VERSION, OR DOWNLOAD EXCEL ORIGINAL
DATA SETS
Data sources:
- "EIVA SURVEY COMPUTER": Collected by a normal PC running EIVA NaviPac software.
- "UKOOA": Produced by software scripts taking EIVA event file as input.
- "AUTO-LOG": PC (Linux) collecting data from:
- Air pressure sensor [serial RS-232]
- Gun controller (GUNCO) [serial RS-232]
- Streamer "bird" system [serial RS-232]
- Navigation survey computer (EIVA) [network UDP telegrams]
- "TRIACQ": WG "Triacq" seismic recording system (Sun SS1000).
SVALEX-2011
Logsheets, one PDF-file for all lines: Svalex-QC-log-2011.pdf
|
SVALEX-2011 DATA
|
| LINE INFORMATION
| EIVA
SURVEY COMPUTER
| UKOOA
| AUTO-LOG2)
| TRIACQ3)
| LOG SHEETS4)
| COMMENTS
|
| ID
| START
SP Date Time [UTC]
Easting Northing
UTM Zone = 33X
| END
SP Date Time [UTC]
Easting Northing
UTM Zone = 33X
| EVENT FILE
| 10 SEC LOGFILE 1)
| P1/90 FILES
| P1/90 QC
|
| VAN MIJEN FJORN
|
| SvalexVMF11-14
| 0747
24.08.2011 - 13:43:43
0527118.43 / 08640856.07
| 1458
24.08.2011 - 17:21:34
0494777.58 / 08626096.45
| Link
| Link
| Link
| Link
| Link Δ
| Link
| -
| -
|
| SvalexVMF11-15
| 2140
25.08.2011 - 07:00:51
0495339.95 08625826.56
| 2813
25.08.2011 - 10:27:30
0525952.57 / 08639797.57
| Link
| Link
| Link
| Link
| Link Δ
| Link
| -
| -
|
| SvalexVMF11-16
| 1465
24.08.2011 - 17:30:29
0495501.32 / 08625352.32
| 2132
24.08.2011 - 20:53:14
0525851.64 / 08639175.34
| Link
| Link
| Link
| Link
| Link Δ
| Link
| -
| -
|
| SvalexVMF11-17
| 2021
23.08.2011 - 10:30:24
527238.3 / 8639268.1
| 2720
23.08.2011 - 14:09:14
0495429.95 / 08624786.7
| Link
| Link
| Link
| Link
| Link Δ
| Link
| -
| -
|
| SvalexVMF11-18
| 0661
22.08.2011 - 14:54:03
0525310.31 / 08637832.30
| 1305
22.08.2011 - 18:14:55
0495992.76 / 08624516.31
| Link
| Link
| Link
| Link
| Link Δ
| Link
| -
| -
|
| SvalexVMF11-19
| 0008
24.08.2011 - 09:35:05
0496261.99 / 08624046.19
| 0739
24.08.2011 - 13:21:56
0529503.23 / 08639241.81
| Link
| Link
| Link
| Link
| Link Δ
| Link
| -
| -
|
| SvalexVMF11-20
| 1311
23.08.2011 - 06:34:46
0496373.72 / 08623560.38
| 2010
23.08.2011 - 10:16:11
0528166.60 / 08638076.29
| Link
| Link
| Link
| Link
| Link Δ
| Link
| -
| -
|
| SvalexVMF11-21
| 0008
22.08.2011 -12:42:01
0497088.06 08623439.35
| 0650
22.08.2011 - 14:40:11
0526333.86 / 08636672.60
| Link
| Link
| Link
| Link
| Link Δ
| Link
| -
| -
|
| ISFJORDEN
|
| Svalex-I-11-Line2
| 0006
26.08.2011 - 09:22:08
0522792.46 / 08709156.93
| 1863
26.08.2011 - 19:00:40
0442648.82 / 08662272.84
| Link
| Link
| Link
| Link
| -
| Link
| -
| -
|
| Svalex-I-11-Line3
| 1892
27.08.2011 - 06:32:27
0443498.94 / 08661611.96
| 3191
27.08.2011 - 13:09:06
0499561.03 / 08694407.40
| Link
| Link
| Link
| Link
| -
| Link
| -
| -
|
| Svalex-I-11-Line4
| 3253
28.08.2011 - 08:22:07
0434423.29 / 08655143.35
| 4353
28.08.2011 - 14:00:08
0481894.66 / 08682918.70
| Link
| Link
| Link
| Link
| -
| Link
| -
| -
|
|
NOTES
1) 10 second interval logfile: Easting, Northing, Lat, Lon, Depth, Gravitymeter, Magnetometer
2) Auto-Log system XML-file, for each shot: Event number, time/position, status each airgun, air pressure, DOL (Distance off line), streamer birds status
3) Triacq recording system logfile (incl. tape status)
4) Logsheets, one PDF-file for all lines: Svalex-QC-log-2011.pdf
|
TEST ISFJORDEN 29. AUGUST 2011
| LINE INFORMATION
| EIVA SURVEY COMPUTER
EVENT FILE
| UKOOA
| LOG SHEETS
| COMMENTS
|
| ID
| START
SP Date Time [UTC]
Easting Northing
UTM Zone = 33X
| END
SP Date Time [UTC]
Easting Northing
UTM Zone = 33X
| P1/90 FILES
| P1/90 QC
|
| 4 GUNS
|
| LINE 1 (4 guns)
| 0288
29.08.2011 -
| 408
29.08.2011 -
| Link
| Link?
| -
| -
| SP=345 Intersection of lines.
|
| LINE 2 (4 guns)
| 0155
29.08.2011 -
| 0283
29.08.2011 -
| Link
| Link?
| -
| -
| SP=223 Intersection of lines.
|
| LINE 3 (4 guns)
| 0003
29.08.2011 -
| 0152
29.08.2011 -
| Link
| Link?
| -
| -
| SP=92 Intersection of lines
|
| LINE 4 (4 guns)
| 0410
29.08.2011 -
| 0541
29.08.2011 -
| Link
| Link?
| -
| -
| SP=479 Intersection of lines.
|
| 1 GUN
|
| LINE 1 (1 gun)
| 0801
29.08.2011 -
| 0925
29.08.2011 -
| Link
| Link?
| -
| -
| SP=865: Intersection of lines.
|
| LINE 2 (1 gun)
| 0547
29.08.2011 -
| 0669
29.08.2011 -
| Link
| Link?
| -
| -
| SP=608: Intersection of lines.
|
| LINE 3 (1 gun)
| 0675
29.08.2011 -
| 0798
29.08.2011 -
| Link
| Link?
| -
| -
| SP=736: Intersection of lines.
|
| LINE 4 (1 gun)
| 0932
29.08.2011 -
| 1058
29.08.2011 -
| Link
| Link?
| -
| -
| SP=997: Intersection of lines.
|
